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drm/i915: Drop fake breadcrumb irq

ソースを参照 
Missed breadcrumb detection is defunct due to the tight coupling with
dma_fence signaling and the myriad ways we may signal fences from
everywhere but from an interrupt, i.e. we frequently signal a fence
before we even see its interrupt. This means that even if we miss an
interrupt for a fence, it still is signaled before our breadcrumb
hangcheck fires, so simplify the breadcrumb hangchecking by moving it
into the GPU hangcheck and forgo fake interrupts.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190129205230.19056-3-chris@chris-wilson.co.uk
このコミットが含まれているのは:
Chris Wilson
2019-01-29 20:52:30 +00:00
親 52c0fdb25c
コミット 789659f430
7個のファイルの変更、5行の追加、256行の削除
Patchファイルをダウンロード Diffファイルをダウンロード すべてのファイルを展開 すべてのファイルを折り畳む

147
drivers/gpu/drm/i915/intel_breadcrumbs.c
ファイルの表示

@@ -91,7 +91,6 @@ bool intel_engine_breadcrumbs_irq(struct intel_engine_cs *engine)
spin_lock(&b->irq_lock);
b->irq_fired = true;
if (b->irq_armed && list_empty(&b->signalers))
__intel_breadcrumbs_disarm_irq(b);
@@ -172,86 +171,6 @@ static void signal_irq_work(struct irq_work *work)
intel_engine_breadcrumbs_irq(engine);
}
static unsigned long wait_timeout(void)
{
return round_jiffies_up(jiffies + DRM_I915_HANGCHECK_JIFFIES);
}
static noinline void missed_breadcrumb(struct intel_engine_cs *engine)
{
if (GEM_SHOW_DEBUG()) {
struct drm_printer p = drm_debug_printer(__func__);
intel_engine_dump(engine, &p,
"%s missed breadcrumb at %pS\n",
engine->name, __builtin_return_address(0));
}
set_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings);
}
static void intel_breadcrumbs_hangcheck(struct timer_list *t)
{
struct intel_engine_cs *engine =
from_timer(engine, t, breadcrumbs.hangcheck);
struct intel_breadcrumbs *b = &engine->breadcrumbs;
if (!b->irq_armed)
return;
if (b->irq_fired)
goto rearm;
/*
* We keep the hangcheck timer alive until we disarm the irq, even
* if there are no waiters at present.
*
* If the waiter was currently running, assume it hasn't had a chance
* to process the pending interrupt (e.g, low priority task on a loaded
* system) and wait until it sleeps before declaring a missed interrupt.
*
* If the waiter was asleep (and not even pending a wakeup), then we
* must have missed an interrupt as the GPU has stopped advancing
* but we still have a waiter. Assuming all batches complete within
* DRM_I915_HANGCHECK_JIFFIES [1.5s]!
*/
synchronize_hardirq(engine->i915->drm.irq);
if (intel_engine_signal_breadcrumbs(engine)) {
missed_breadcrumb(engine);
mod_timer(&b->fake_irq, jiffies + 1);
} else {
rearm:
b->irq_fired = false;
mod_timer(&b->hangcheck, wait_timeout());
}
}
static void intel_breadcrumbs_fake_irq(struct timer_list *t)
{
struct intel_engine_cs *engine =
from_timer(engine, t, breadcrumbs.fake_irq);
struct intel_breadcrumbs *b = &engine->breadcrumbs;
/*
* The timer persists in case we cannot enable interrupts,
* or if we have previously seen seqno/interrupt incoherency
* ("missed interrupt" syndrome, better known as a "missed breadcrumb").
* Here the worker will wake up every jiffie in order to kick the
* oldest waiter to do the coherent seqno check.
*/
if (!intel_engine_signal_breadcrumbs(engine) && !b->irq_armed)
return;
/* If the user has disabled the fake-irq, restore the hangchecking */
if (!test_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings)) {
mod_timer(&b->hangcheck, wait_timeout());
return;
}
mod_timer(&b->fake_irq, jiffies + 1);
}
void intel_engine_pin_breadcrumbs_irq(struct intel_engine_cs *engine)
{
struct intel_breadcrumbs *b = &engine->breadcrumbs;
@@ -274,43 +193,14 @@ void intel_engine_unpin_breadcrumbs_irq(struct intel_engine_cs *engine)
spin_unlock_irq(&b->irq_lock);
}
static bool use_fake_irq(const struct intel_breadcrumbs *b)
{
const struct intel_engine_cs *engine =
container_of(b, struct intel_engine_cs, breadcrumbs);
if (!test_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings))
return false;
/*
* Only start with the heavy weight fake irq timer if we have not
* seen any interrupts since enabling it the first time. If the
* interrupts are still arriving, it means we made a mistake in our
* engine->seqno_barrier(), a timing error that should be transient
* and unlikely to reoccur.
*/
return !b->irq_fired;
}
static void enable_fake_irq(struct intel_breadcrumbs *b)
{
/* Ensure we never sleep indefinitely */
if (!b->irq_enabled || use_fake_irq(b))
mod_timer(&b->fake_irq, jiffies + 1);
else
mod_timer(&b->hangcheck, wait_timeout());
}
static bool __intel_breadcrumbs_arm_irq(struct intel_breadcrumbs *b)
static void __intel_breadcrumbs_arm_irq(struct intel_breadcrumbs *b)
{
struct intel_engine_cs *engine =
container_of(b, struct intel_engine_cs, breadcrumbs);
struct drm_i915_private *i915 = engine->i915;
bool enabled;
lockdep_assert_held(&b->irq_lock);
if (b->irq_armed)
return false;
return;
/*
* The breadcrumb irq will be disarmed on the interrupt after the
@@ -328,16 +218,8 @@ static bool __intel_breadcrumbs_arm_irq(struct intel_breadcrumbs *b)
* the driver is idle) we disarm the breadcrumbs.
*/
/* No interrupts? Kick the waiter every jiffie! */
enabled = false;
if (!b->irq_enabled++ &&
!test_bit(engine->id, &i915->gpu_error.test_irq_rings)) {
if (!b->irq_enabled++)
irq_enable(engine);
enabled = true;
}
enable_fake_irq(b);
return enabled;
}
void intel_engine_init_breadcrumbs(struct intel_engine_cs *engine)
@@ -348,18 +230,6 @@ void intel_engine_init_breadcrumbs(struct intel_engine_cs *engine)
INIT_LIST_HEAD(&b->signalers);
init_irq_work(&b->irq_work, signal_irq_work);
timer_setup(&b->fake_irq, intel_breadcrumbs_fake_irq, 0);
timer_setup(&b->hangcheck, intel_breadcrumbs_hangcheck, 0);
}
static void cancel_fake_irq(struct intel_engine_cs *engine)
{
struct intel_breadcrumbs *b = &engine->breadcrumbs;
del_timer_sync(&b->fake_irq); /* may queue b->hangcheck */
del_timer_sync(&b->hangcheck);
clear_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings);
}
void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine)
@@ -369,13 +239,6 @@ void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine)
spin_lock_irqsave(&b->irq_lock, flags);
/*
* Leave the fake_irq timer enabled (if it is running), but clear the
* bit so that it turns itself off on its next wake up and goes back
* to the long hangcheck interval if still required.
*/
clear_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings);
if (b->irq_enabled)
irq_enable(engine);
else
@@ -386,7 +249,6 @@ void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine)
void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine)
{
cancel_fake_irq(engine);
}
bool i915_request_enable_breadcrumb(struct i915_request *rq)
@@ -482,7 +344,4 @@ void intel_engine_print_breadcrumbs(struct intel_engine_cs *engine,
}
}
spin_unlock_irq(&b->irq_lock);
if (test_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings))
drm_printf(p, "Fake irq active\n");
}